	Authors	Year	Title
	Glenister & Furnish	1988	Terminal Progenesis in Late Paleozoic Ammonoid Families. In: Wiedmann, J. & Kullmann, J. (Eds.), Cephalopods - Present and Past: 51-66, fig.1-3; Stuttgart.
	Miller & Cline	1934	The cephalopods of the Phosphoria Formation of Northwestern United States. Journal of Paleontology, 8 (3): 281-302, fig.1, pl.39; Tulsa, Oklahoma.
	Ruzhencev	1936	Paleontologicheskie zametki o kamennougol'nykh i permskikh ammoneiakh. [Paleontological remarks on Carboniferous and Permian ammonoids.] Problemy sovetskoi geologii, 12: 1072-1088, fig.1-5; Moskva.